Ergotamine is the correct answer because it is a medication that belongs to the class of drugs called ergot alkaloids. It is commonly used to treat migraines and cluster headaches. Ergotamine works by constricting blood vessels in the brain, which helps to alleviate the pain and other symptoms associated with migraines. It is available in various forms, including tablets, nasal sprays, and suppositories. Ergomar, on the other hand, is a brand name for a specific formulation of ergotamine that is used to treat migraines. Therefore, Ergotamine is the more general term, while Ergomar refers to a specific brand of ergotamine medication.